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dbf1cbd5bd502d76451d93044019f592d6a694af
sdk/lib/html/scripts/systemhtml.py
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podivilov@google.com b001a58bca Get rid of System classes for backend generators. 
They introduce unnecessary level of indirection with no added value.

R=antonm@google.com,vsm@google.com

Review URL: https://codereview.chromium.org//10986048

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@12946 260f80e4-7a28-3924-810f-c04153c831b5
2012-09-27 10:25:08 +00:00

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#!/usr/bin/python
# Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
# for details. All rights reserved. Use of this source code is governed by a
# BSD-style license that can be found in the LICENSE file.
"""This module provides shared functionality for the system to generate
Dart:html APIs from the IDL database."""
import emitter
from systemdart2js import *
from systeminterface import *
_js_custom_members = set([
'CSSStyleDeclaration.setProperty',
'Element.insertAdjacentElement',
'Element.insertAdjacentHTML',
'Element.insertAdjacentText',
'Element.remove',
'ElementEvents.mouseWheel',
'IDBDatabase.transaction',
'IFrameElement.contentWindow',
'MouseEvent.offsetX',
'MouseEvent.offsetY',
'TableElement.createTBody',
'Window.document',
'Window.indexedDB',
'Window.location',
'Window.open',
'Window.top',
'Window.webkitCancelAnimationFrame',
'Window.webkitRequestAnimationFrame',
])
# This map controls merging of interfaces in dart:html library.
# All constants, attributes, and operations of merged interface (key) are
# added to target interface (value). All references to the merged interface
# (e.g. parameter types, return types, parent interfaces) are replaced with
# target interface. There are two important restrictions:
# 1) Merged and target interfaces shouldn't have common members, otherwise there
# would be duplicated declarations in generated Dart code.
# 2) Merged interface should be direct child of target interface, so the
# children of merged interface are not affected by the merge.
# As a consequence, target interface implementation and its direct children
# interface implementations should implement merged attribute accessors and
# operations. For example, SVGElement and Element implementation classes should
# implement HTMLElement.insertAdjacentElement(), HTMLElement.innerHTML, etc.
_merged_html_interfaces = {
'HTMLDocument': 'Document',
'HTMLElement': 'Element'
}
# Events without onEventName attributes in the IDL we want to support.
# We can automatically extract most event event names by checking for
# onEventName methods in the IDL but some events aren't listed so we need
# to manually add them here so that they are easy for users to find.
_html_manual_events = {
'Element': ['touchleave', 'touchenter', 'webkitTransitionEnd'],
'Window': ['DOMContentLoaded']
}
# These event names must be camel case when attaching event listeners
# using addEventListener even though the onEventName properties in the DOM for
# them are not camel case.
_on_attribute_to_event_name_mapping = {
'webkitanimationend': 'webkitAnimationEnd',
'webkitanimationiteration': 'webkitAnimationIteration',
'webkitanimationstart': 'webkitAnimationStart',
'webkitspeechchange': 'webkitSpeechChange',
'webkittransitionend': 'webkitTransitionEnd',
}
# Mapping from raw event names to the pretty camelCase event names exposed as
# properties in dart:html. If the DOM exposes a new event name, you will need
# to add the lower case to camel case conversion for that event name here.
_html_event_names = {
'DOMContentLoaded': 'contentLoaded',
'abort': 'abort',
'addstream': 'addStream',
'addtrack': 'addTrack',
'audioend': 'audioEnd',
'audioprocess': 'audioProcess',
'audiostart': 'audioStart',
'beforecopy': 'beforeCopy',
'beforecut': 'beforeCut',
'beforepaste': 'beforePaste',
'beforeunload': 'beforeUnload',
'blocked': 'blocked',
'blur': 'blur',
'cached': 'cached',
'canplay': 'canPlay',
'canplaythrough': 'canPlayThrough',
'change': 'change',
'chargingchange': 'chargingChange',
'chargingtimechange': 'chargingTimeChange',
'checking': 'checking',
'click': 'click',
'close': 'close',
'complete': 'complete',
'connect': 'connect',
'connecting': 'connecting',
'contextmenu': 'contextMenu',
'copy': 'copy',
'cuechange': 'cueChange',
'cut': 'cut',
'dblclick': 'doubleClick',
'devicemotion': 'deviceMotion',
'deviceorientation': 'deviceOrientation',
'dischargingtimechange': 'dischargingTimeChange',
'display': 'display',
'downloading': 'downloading',
'drag': 'drag',
'dragend': 'dragEnd',
'dragenter': 'dragEnter',
'dragleave': 'dragLeave',
'dragover': 'dragOver',
'dragstart': 'dragStart',
'drop': 'drop',
'durationchange': 'durationChange',
'emptied': 'emptied',
'end': 'end',
'ended': 'ended',
'enter': 'enter',
'error': 'error',
'exit': 'exit',
'focus': 'focus',
'hashchange': 'hashChange',
'icecandidate': 'iceCandidate',
'icechange': 'iceChange',
'input': 'input',
'invalid': 'invalid',
'keydown': 'keyDown',
'keypress': 'keyPress',
'keyup': 'keyUp',
'levelchange': 'levelChange',
'load': 'load',
'loadeddata': 'loadedData',
'loadedmetadata': 'loadedMetadata',
'loadend': 'loadEnd',
'loadstart': 'loadStart',
'message': 'message',
'mousedown': 'mouseDown',
'mousemove': 'mouseMove',
'mouseout': 'mouseOut',
'mouseover': 'mouseOver',
'mouseup': 'mouseUp',
'mousewheel': 'mouseWheel',
'mute': 'mute',
'negotiationneeded': 'negotiationNeeded',
'nomatch': 'noMatch',
'noupdate': 'noUpdate',
'obsolete': 'obsolete',
'offline': 'offline',
'online': 'online',
'open': 'open',
'pagehide': 'pageHide',
'pageshow': 'pageShow',
'paste': 'paste',
'pause': 'pause',
'play': 'play',
'playing': 'playing',
'popstate': 'popState',
'progress': 'progress',
'ratechange': 'rateChange',
'readystatechange': 'readyStateChange',
'removestream': 'removeStream',
'removetrack': 'removeTrack',
'reset': 'reset',
'resize': 'resize',
'result': 'result',
'resultdeleted': 'resultDeleted',
'scroll': 'scroll',
'search': 'search',
'seeked': 'seeked',
'seeking': 'seeking',
'select': 'select',
'selectionchange': 'selectionChange',
'selectstart': 'selectStart',
'show': 'show',
'soundend': 'soundEnd',
'soundstart': 'soundStart',
'speechend': 'speechEnd',
'speechstart': 'speechStart',
'stalled': 'stalled',
'start': 'start',
'statechange': 'stateChange',
'storage': 'storage',
'submit': 'submit',
'success': 'success',
'suspend': 'suspend',
'timeupdate': 'timeUpdate',
'touchcancel': 'touchCancel',
'touchend': 'touchEnd',
'touchenter': 'touchEnter',
'touchleave': 'touchLeave',
'touchmove': 'touchMove',
'touchstart': 'touchStart',
'unload': 'unload',
'upgradeneeded': 'upgradeNeeded',
'unmute': 'unmute',
'updateready': 'updateReady',
'versionchange': 'versionChange',
'volumechange': 'volumeChange',
'waiting': 'waiting',
'webkitAnimationEnd': 'animationEnd',
'webkitAnimationIteration': 'animationIteration',
'webkitAnimationStart': 'animationStart',
'webkitfullscreenchange': 'fullscreenChange',
'webkitfullscreenerror': 'fullscreenError',
'webkitkeyadded': 'keyAdded',
'webkitkeyerror': 'keyError',
'webkitkeymessage': 'keyMessage',
'webkitneedkey': 'needKey',
'webkitpointerlockchange': 'pointerLockChange',
'webkitpointerlockerror': 'pointerLockError',
'webkitSpeechChange': 'speechChange',
'webkitsourceclose': 'sourceClose',
'webkitsourceended': 'sourceEnded',
'webkitsourceopen': 'sourceOpen',
'webkitTransitionEnd': 'transitionEnd',
'write': 'write',
'writeend': 'writeEnd',
'writestart': 'writeStart'
}
# Information for generating element constructors.
#
# TODO(sra): maybe remove all the argument complexity and use cascades.
#
# var c = new CanvasElement(width: 100, height: 70);
# var c = new CanvasElement()..width = 100..height = 70;
#
class ElementConstructorInfo(object):
def __init__(self, name=None, tag=None,
params=[], opt_params=[],
factory_provider_name='_Elements'):
self.name = name # The constructor name 'h1' in 'HeadingElement.h1'
self.tag = tag or name # The HTML tag
self.params = params
self.opt_params = opt_params
self.factory_provider_name = factory_provider_name
def ConstructorInfo(self, interface_name):
info = OperationInfo()
info.overloads = None
info.declared_name = interface_name
info.name = interface_name
info.constructor_name = self.name
info.js_name = None
info.type_name = interface_name
info.param_infos = map(lambda tXn: ParamInfo(tXn[1], None, tXn[0], 'null'),
self.opt_params)
return info
_html_element_constructors = {
'AnchorElement' :
ElementConstructorInfo(tag='a', opt_params=[('String', 'href')]),
'AreaElement': 'area',
'ButtonElement': 'button',
'BRElement': 'br',
'BaseElement': 'base',
'BodyElement': 'body',
'ButtonElement': 'button',
'CanvasElement':
ElementConstructorInfo(tag='canvas',
opt_params=[('int', 'width'), ('int', 'height')]),
'ContentElement': 'content',
'DataListElement': 'datalist',
'DListElement': 'dl',
'DetailsElement': 'details',
'DivElement': 'div',
'EmbedElement': 'embed',
'FieldSetElement': 'fieldset',
'FormElement': 'form',
'HRElement': 'hr',
'HeadElement': 'head',
'HeadingElement': [ElementConstructorInfo('h1'),
ElementConstructorInfo('h2'),
ElementConstructorInfo('h3'),
ElementConstructorInfo('h4'),
ElementConstructorInfo('h5'),
ElementConstructorInfo('h6')],
'HtmlElement': 'html',
'IFrameElement': 'iframe',
'ImageElement':
ElementConstructorInfo(tag='img',
opt_params=[('String', 'src'),
('int', 'width'), ('int', 'height')]),
'InputElement':
ElementConstructorInfo(tag='input', opt_params=[('String', 'type')]),
'KeygenElement': 'keygen',
'LIElement': 'li',
'LabelElement': 'label',
'LegendElement': 'legend',
'LinkElement': 'link',
'MapElement': 'map',
'MenuElement': 'menu',
'MeterElement': 'meter',
'OListElement': 'ol',
'ObjectElement': 'object',
'OptGroupElement': 'optgroup',
'OutputElement': 'output',
'ParagraphElement': 'p',
'ParamElement': 'param',
'PreElement': 'pre',
'ProgressElement': 'progress',
'ScriptElement': 'script',
'SelectElement': 'select',
'SourceElement': 'source',
'SpanElement': 'span',
'StyleElement': 'style',
'TableCaptionElement': 'caption',
'TableCellElement': 'td',
'TableColElement': 'col',
'TableElement': 'table',
'TableRowElement': 'tr',
#'TableSectionElement' <thead> <tbody> <tfoot>
'TextAreaElement': 'textarea',
'TitleElement': 'title',
'TrackElement': 'track',
'UListElement': 'ul',
'VideoElement': 'video'
}
def HtmlElementConstructorInfos(typename):
"""Returns list of ElementConstructorInfos about the convenience constructors
for an Element."""
# TODO(sra): Handle multiple and named constructors.
if typename not in _html_element_constructors:
return []
infos = _html_element_constructors[typename]
if isinstance(infos, str):
infos = ElementConstructorInfo(tag=infos)
if not isinstance(infos, list):
infos = [infos]
return infos
def EmitHtmlElementFactoryConstructors(emitter, infos, typename, class_name):
for info in infos:
constructor_info = info.ConstructorInfo(typename)
inits = emitter.Emit(
'\n'
' static $RETURN_TYPE $CONSTRUCTOR($PARAMS) {\n'
' $CLASS _e = _document.$dom_createElement("$TAG");\n'
'$!INITS'
' return _e;\n'
' }\n',
RETURN_TYPE=constructor_info.type_name,
CONSTRUCTOR=constructor_info.ConstructorFactoryName(DartType),
CLASS=class_name,
TAG=info.tag,
PARAMS=constructor_info.ParametersInterfaceDeclaration(DartType))
for param in constructor_info.param_infos:
inits.Emit(' if ($E != null) _e.$E = $E;\n', E=param.name)
# These classes require an explicit declaration for the "on" method even though
# they don't declare any unique events, because the concrete class hierarchy
# doesn't match the interface hierarchy.
_html_explicit_event_classes = set(['DocumentFragment'])
def _OnAttributeToEventName(on_method):
event_name = on_method.id[2:]
if event_name in _on_attribute_to_event_name_mapping:
return _on_attribute_to_event_name_mapping[event_name]
else:
return event_name
def DomToHtmlEvents(interface_id, events):
event_names = set(map(_OnAttributeToEventName, events))
if interface_id in _html_manual_events:
for manual_event_name in _html_manual_events[interface_id]:
event_names.add(manual_event_name)
return sorted(event_names, key=lambda name: _html_event_names[name])
def DomToHtmlEvent(event_name):
assert event_name in _html_event_names, \
'No known html event name for event: ' + event_name
return _html_event_names[event_name]
# ------------------------------------------------------------------------------
class HtmlSystemShared(object):
def __init__(self, context):
self._event_classes = set()
self._seen_event_names = {}
self._database = context.database
# TODO(jacobr): this already exists
def _TraverseParents(self, interface, callback):
for parent in interface.parents:
parent_id = parent.type.id
if self._database.HasInterface(parent_id):
parent_interface = self._database.GetInterface(parent_id)
callback(parent_interface)
self._TraverseParents(parent_interface, callback)
# TODO(jacobr): this isn't quite right....
def GetParentsEventsClasses(self, interface):
# Ugly hack as we don't specify that Document and DocumentFragment inherit
# from Element in our IDL.
if interface.id == 'Document' or interface.id == 'DocumentFragment':
return ['ElementEvents']
interfaces_with_events = set()
def visit(parent):
if parent.id in self._event_classes:
interfaces_with_events.add(parent)
self._TraverseParents(interface, visit)
if len(interfaces_with_events) == 0:
return ['Events']
else:
names = []
for interface in interfaces_with_events:
names.append(interface.id + 'Events')
return names
def GetParentEventsClass(self, interface):
parent_event_classes = self.GetParentsEventsClasses(interface)
if len(parent_event_classes) != 1:
raise Exception('Only one parent event class allowed ' + interface.id)
return parent_event_classes[0]
# This returns two values: the first is whether or not an "on" property should
# be generated for the interface, and the second is the event attributes to
# generate if it should.
def GetEventAttributes(self, interface):
events = set([attr for attr in interface.attributes
if attr.type.id == 'EventListener'])
if events or interface.id in _html_explicit_event_classes:
return True, events
else:
return False, None
def IsPrivate(self, name):
return name.startswith('_')
class HtmlInterfacesSystem(System):
def __init__(self, options, dart_library_generator, backend_factory):
super(HtmlInterfacesSystem, self).__init__(options)
self._dart_library_generator = dart_library_generator
self._backend_factory = backend_factory
self._shared = HtmlSystemShared(options)
self._elements_factory_emitter = None
def ProcessInterface(self, interface):
backend = self._backend_factory(interface)
HtmlDartInterfaceGenerator(self, interface, backend).Generate()
def _CreateEmitter(self, filename):
return self._dart_library_generator.CreateFileEmitter(filename)
# ------------------------------------------------------------------------------
class HtmlDartInterfaceGenerator(BaseGenerator):
"""Generates dart interface and implementation for the DOM IDL interface."""
def __init__(self, system, interface, backend):
super(HtmlDartInterfaceGenerator, self).__init__(
system._database, system._type_registry, interface)
self._system = system
self._backend = backend
self._shared = system._shared
self._html_interface_name = system._renamer.RenameInterface(self._interface)
def GenerateCallback(self, info):
"""Generates a typedef for the callback interface."""
code = self._system._CreateEmitter('%s.dart' % self._interface.id)
code.Emit(self._system._templates.Load('callback.darttemplate'))
code.Emit('typedef $TYPE $NAME($PARAMS);\n',
NAME=self._interface.id,
TYPE=DartType(info.type_name),
PARAMS=info.ParametersImplementationDeclaration(DartType))
self._backend.GenerateCallback(info)
def StartInterface(self):
if (not self._interface.id in _merged_html_interfaces and
# Don't re-generate types that have been converted to native dart types.
self._html_interface_name not in nativified_classes):
path = '%s.dart' % self._html_interface_name
self._interface_emitter = self._system._CreateEmitter(path)
else:
self._interface_emitter = emitter.Emitter()
template_file = 'interface_%s.darttemplate' % self._html_interface_name
interface_template = (self._system._templates.TryLoad(template_file) or
self._system._templates.Load('interface.darttemplate'))
typename = self._html_interface_name
implements = []
suppressed_implements = []
for parent in self._interface.parents:
# TODO(vsm): Remove source_filter.
if MatchSourceFilter(parent):
# Parent is a DOM type.
implements.append(self._DartType(parent.type.id))
elif '<' in parent.type.id:
# Parent is a Dart collection type.
# TODO(vsm): Make this check more robust.
implements.append(self._DartType(parent.type.id))
else:
suppressed_implements.append('%s.%s' %
(self._common_prefix, self._DartType(parent.type.id)))
comment = ' extends'
implements_str = ''
if implements:
implements_str += ' implements ' + ', '.join(implements)
comment = ','
if suppressed_implements:
implements_str += ' /*%s %s */' % (comment,
', '.join(suppressed_implements))
factory_provider = None
if typename in interface_factories:
factory_provider = interface_factories[typename]
constructors = []
constructor_info = AnalyzeConstructor(self._interface)
if constructor_info:
constructors.append(constructor_info)
factory_provider = '_' + typename + 'FactoryProvider'
factory_provider_emitter = self._system._CreateEmitter(
'_%sFactoryProvider.dart' % self._html_interface_name)
self._backend.EmitFactoryProvider(
constructor_info, factory_provider, factory_provider_emitter)
infos = HtmlElementConstructorInfos(typename)
if infos:
if not self._system._elements_factory_emitter:
file_emitter = self._system._CreateEmitter('_Elements.dart')
template = self._system._templates.Load(
'factoryprovider_Elements.darttemplate')
self._system._elements_factory_emitter = file_emitter.Emit(template)
EmitHtmlElementFactoryConstructors(
self._system._elements_factory_emitter,
infos,
self._html_interface_name,
self._backend.ImplementationClassName())
for info in infos:
constructors.append(info.ConstructorInfo(typename))
if factory_provider:
assert factory_provider == info.factory_provider_name
else:
factory_provider = info.factory_provider_name
# TODO(vsm): Add appropriate package / namespace syntax.
(self._type_comment_emitter,
self._members_emitter,
self._top_level_emitter) = self._interface_emitter.Emit(
interface_template + '$!TOP_LEVEL',
ID=typename,
EXTENDS=implements_str)
self._type_comment_emitter.Emit("/// @domName $DOMNAME",
DOMNAME=self._interface.doc_js_name)
if self._backend.HasImplementation():
if not self._interface.id in _merged_html_interfaces:
name = self._html_interface_name
if self._html_interface_name in nativified_classes:
name = nativified_classes[self._html_interface_name]
filename = '%sImpl.dart' % name
else:
filename = '%sImpl_Merged.dart' % self._html_interface_name
self._implementation_emitter = self._system._CreateEmitter(filename)
else:
self._implementation_emitter = emitter.Emitter()
self._backend.SetImplementationEmitter(self._implementation_emitter)
self._implementation_members_emitter = self._backend.StartInterface()
for constructor_info in constructors:
constructor_info.GenerateFactoryInvocation(
self._DartType, self._members_emitter, factory_provider)
element_type = MaybeTypedArrayElementTypeInHierarchy(
self._interface, self._system._database)
if element_type:
self._members_emitter.Emit(
'\n'
' factory $CTOR(int length) =>\n'
' $FACTORY.create$(CTOR)(length);\n'
'\n'
' factory $CTOR.fromList(List<$TYPE> list) =>\n'
' $FACTORY.create$(CTOR)_fromList(list);\n'
'\n'
' factory $CTOR.fromBuffer(ArrayBuffer buffer, [int byteOffset, int length]) => \n'
' $FACTORY.create$(CTOR)_fromBuffer(buffer, byteOffset, length);\n',
CTOR=self._interface.id,
TYPE=self._DartType(element_type),
FACTORY=factory_provider)
self._GenerateEvents()
old_backend = self._backend
if not self._backend.ImplementsMergedMembers():
self._backend = HtmlGeneratorDummyBackend()
for merged_interface in _merged_html_interfaces:
if _merged_html_interfaces[merged_interface] == self._interface.id:
merged_interface = self._database.GetInterface(merged_interface)
self.AddMembers(merged_interface)
self._backend = old_backend
def AddIndexer(self, element_type):
self._backend.AddIndexer(element_type)
def AmendIndexer(self, element_type):
self._backend.AmendIndexer(element_type)
def AddAttribute(self, attribute, is_secondary=False):
dom_name = DartDomNameOfAttribute(attribute)
html_name = self._system._renamer.RenameMember(
self._interface.id, dom_name, 'get:')
if not html_name or self._shared.IsPrivate(html_name):
return
html_setter_name = self._system._renamer.RenameMember(
self._interface.id, dom_name, 'set:')
read_only = IsReadOnly(attribute) or not html_setter_name
# We don't yet handle inconsistent renames of the getter and setter yet.
assert(not html_setter_name or html_name == html_setter_name)
if not is_secondary:
self._members_emitter.Emit('\n /** @domName $DOMINTERFACE.$DOMNAME */',
DOMINTERFACE=attribute.doc_js_interface_name,
DOMNAME=dom_name)
if read_only:
template = '\n abstract $TYPE get $NAME;\n'
else:
template = '\n $TYPE $NAME;\n'
self._members_emitter.Emit(template,
NAME=html_name,
TYPE=self._DartType(attribute.type.id))
self._backend.AddAttribute(attribute, html_name, read_only)
def AddSecondaryAttribute(self, interface, attribute):
self._backend.SecondaryContext(interface)
self.AddAttribute(attribute, True)
def AddOperation(self, info, skip_declaration=False):
"""
Arguments:
operations - contains the overloads, one or more operations with the same
name.
"""
html_name = self._system._renamer.RenameMember(self._interface.id, info.name)
if not html_name:
if info.name == 'item':
# FIXME: item should be renamed to operator[], not removed.
self._backend.AddOperation(info, '_item')
return
if not self._shared.IsPrivate(html_name) and not skip_declaration:
self._members_emitter.Emit('\n /** @domName $DOMINTERFACE.$DOMNAME */',
DOMINTERFACE=info.overloads[0].doc_js_interface_name,
DOMNAME=info.name)
if info.IsStatic():
# FIXME: provide a type.
self._members_emitter.Emit('\n'
' static final $NAME = $IMPL_CLASS_NAME.$NAME;\n',
IMPL_CLASS_NAME=self._backend.ImplementationClassName(),
NAME=html_name)
else:
self._members_emitter.Emit('\n'
' $TYPE $NAME($PARAMS);\n',
TYPE=self._DartType(info.type_name),
NAME=html_name,
PARAMS=info.ParametersInterfaceDeclaration(self._DartType))
self._backend.AddOperation(info, html_name)
def AddSecondaryOperation(self, interface, info):
self._backend.SecondaryContext(interface)
self.AddOperation(info, True)
def FinishInterface(self):
self._backend.FinishInterface()
def AddConstant(self, constant):
type = TypeOrNothing(self._DartType(constant.type.id), constant.type.id)
self._members_emitter.Emit('\n static const $TYPE$NAME = $VALUE;\n',
NAME=constant.id,
TYPE=type,
VALUE=constant.value)
self._backend.AddConstant(constant)
def _GenerateEvents(self):
emit_events, event_attrs = self._shared.GetEventAttributes(self._interface)
if not emit_events:
return
self._shared._event_classes.add(self._interface.id)
events_interface = self._html_interface_name + 'Events'
events_class = '_%sImpl' % events_interface
parent_events_interface = self._shared.GetParentEventsClass(self._interface)
parent_events_class = '_%sImpl' % parent_events_interface
if not event_attrs:
self._EmitEventGetter(parent_events_interface, parent_events_class)
return
self._EmitEventGetter(events_interface, events_class)
events_members = self._interface_emitter.Emit(
'\nabstract class $INTERFACE implements $PARENTS {\n$!MEMBERS}\n',
INTERFACE=events_interface,
PARENTS=', '.join(
self._shared.GetParentsEventsClasses(self._interface)))
template_file = 'impl_%s.darttemplate' % events_interface
template = (self._system._templates.TryLoad(template_file) or
'\n'
'class $CLASSNAME extends $SUPER implements $INTERFACE {\n'
' $CLASSNAME(_ptr) : super(_ptr);\n'
'$!MEMBERS}\n')
# TODO(jacobr): specify the type of _ptr as EventTarget
implementation_events_members = self._implementation_emitter.Emit(
template,
CLASSNAME=events_class,
INTERFACE=events_interface,
SUPER=parent_events_class)
event_attrs = DomToHtmlEvents(self._html_interface_name, event_attrs)
for event_name in event_attrs:
if event_name in _html_event_names:
dart_event_name = _html_event_names[event_name]
events_members.Emit('\n EventListenerList get $NAME;\n',
NAME=dart_event_name)
if not self._backend.HasCustomEventImplementation(dart_event_name):
implementation_events_members.Emit(
"\n"
" EventListenerList get $NAME => this['$DOM_NAME'];\n",
NAME=dart_event_name,
DOM_NAME=event_name)
else:
raise Exception('No known html even name for event: ' + event_name)
def _EmitEventGetter(self, events_interface, events_class):
self._members_emitter.Emit(
'\n /**'
'\n * @domName EventTarget.addEventListener, '
'EventTarget.removeEventListener, EventTarget.dispatchEvent'
'\n */'
'\n $TYPE get on;\n',
TYPE=events_interface)
self._implementation_members_emitter.Emit(
'\n $TYPE get on =>\n new $TYPE(this);\n',
TYPE=events_class)
class HtmlGeneratorDummyBackend(object):
def AddAttribute(self, attribute, html_name, read_only):
pass
def AddOperation(self, info, html_name):
pass
# ------------------------------------------------------------------------------
# TODO(jmesserly): inheritance is probably not the right way to factor this long
# term, but it makes merging better for now.
class Dart2JSBackend(Dart2JSInterfaceGenerator):
"""Generates a dart2js class for the dart:html library from a DOM IDL
interface.
"""
def __init__(self, interface, options):
super(Dart2JSBackend, self).__init__(options, interface, None, None)
self._html_interface_name = options.renamer.RenameInterface(self._interface)
def HasImplementation(self):
return not (IsPureInterface(self._interface.id) or
self._interface.id in _merged_html_interfaces)
def ImplementationClassName(self):
return self._ImplClassName(self._html_interface_name)
def SetImplementationEmitter(self, implementation_emitter):
self._dart_code = implementation_emitter
def ImplementsMergedMembers(self):
return True
def _ImplClassName(self, type_name):
name = type_name
if type_name in nativified_classes:
name = nativified_classes[type_name]
return '_%sImpl' % name
def StartInterface(self):
interface = self._interface
interface_name = interface.id
self._class_name = self._ImplClassName(self._html_interface_name)
base = None
if interface.parents:
supertype = interface.parents[0].type.id
if IsDartCollectionType(supertype):
# List methods are injected in AddIndexer.
pass
elif IsPureInterface(supertype):
pass
else:
base = self._ImplClassName(self._DartType(supertype))
native_spec = MakeNativeSpec(interface.javascript_binding_name)
extends = ' extends ' + base if base else ''
# TODO: Include all implemented interfaces, including other Lists.
implements = [self._html_interface_name]
element_type = MaybeTypedArrayElementType(self._interface)
if element_type:
implements.append('List<%s>' % self._DartType(element_type))
if self._HasJavaScriptIndexingBehaviour():
implements.append('JavaScriptIndexingBehavior')
template_file = 'impl_%s.darttemplate' % self._html_interface_name
template = (self._template_loader.TryLoad(template_file) or
self._template_loader.Load('dart2js_impl.darttemplate'))
self._members_emitter = self._dart_code.Emit(
template,
#class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
#$!MEMBERS
#}
CLASSNAME=self._class_name,
EXTENDS=extends,
IMPLEMENTS=' implements ' + ', '.join(implements),
NATIVESPEC=' native "' + native_spec + '"')
if self._members_emitter == None:
raise Exception("Class %s doesn't use the $!MEMBERS variable" %
self._class_name)
return self._members_emitter
def EmitFactoryProvider(self, constructor_info, factory_provider, emitter):
template_file = ('factoryprovider_%s.darttemplate' %
self._html_interface_name)
template = self._template_loader.TryLoad(template_file)
if not template:
template = self._template_loader.Load('factoryprovider.darttemplate')
emitter.Emit(
template,
FACTORYPROVIDER=factory_provider,
CONSTRUCTOR=self._html_interface_name,
PARAMETERS=constructor_info.ParametersImplementationDeclaration(self._DartType),
NAMED_CONSTRUCTOR=constructor_info.name or self._html_interface_name,
ARGUMENTS=constructor_info.ParametersAsArgumentList())
def AddIndexer(self, element_type):
"""Adds all the methods required to complete implementation of List."""
# We would like to simply inherit the implementation of everything except
# length, [], and maybe []=. It is possible to extend from a base
# array implementation class only when there is no other implementation
# inheritance. There might be no implementation inheritance other than
# DOMBaseWrapper for many classes, but there might be some where the
# array-ness is introduced by a non-root interface:
#
# interface Y extends X, List<T> ...
#
# In the non-root case we have to choose between:
#
# class YImpl extends XImpl { add List<T> methods; }
#
# and
#
# class YImpl extends ListBase<T> { copies of transitive XImpl methods; }
#
self._members_emitter.Emit(
'\n'
' $TYPE operator[](int index) native "return this[index];";\n',
TYPE=self._NarrowOutputType(element_type))
if 'CustomIndexedSetter' in self._interface.ext_attrs:
self._members_emitter.Emit(
'\n'
' void operator[]=(int index, $TYPE value) native "this[index] = value";\n',
TYPE=self._NarrowInputType(element_type))
else:
# The HTML library implementation of NodeList has a custom indexed setter
# implementation that uses the parent node the NodeList is associated
# with if one is available.
if self._interface.id != 'NodeList':
self._members_emitter.Emit(
'\n'
' void operator[]=(int index, $TYPE value) {\n'
' throw new UnsupportedOperationException("Cannot assign element of immutable List.");\n'
' }\n',
TYPE=self._NarrowInputType(element_type))
# TODO(sra): Use separate mixins for mutable implementations of List<T>.
# TODO(sra): Use separate mixins for typed array implementations of List<T>.
if self._interface.id != 'NodeList':
template_file = 'immutable_list_mixin.darttemplate'
template = self._template_loader.Load(template_file)
self._members_emitter.Emit(template, E=self._DartType(element_type))
def AddAttribute(self, attribute, html_name, read_only):
if self._HasCustomImplementation(attribute.id):
return
if attribute.id != html_name:
self._AddAttributeUsingProperties(attribute, html_name, read_only)
return
# If the attribute is shadowing, we can't generate a shadowing
# field (Issue 1633).
# TODO(sra): _FindShadowedAttribute does not take into account the html
# renaming. we should be looking for another attribute that has the same
# html_name. Two attributes with the same IDL name might not match if one
# is renamed.
(super_attribute, super_attribute_interface) = self._FindShadowedAttribute(
attribute, _merged_html_interfaces)
if super_attribute:
if read_only:
if attribute.type.id == super_attribute.type.id:
# Compatible attribute, use the superclass property. This works
# because JavaScript will do its own dynamic dispatch.
self._members_emitter.Emit(
'\n'
' // Use implementation from $SUPER.\n'
' // final $TYPE $NAME;\n',
SUPER=super_attribute_interface,
NAME=DartDomNameOfAttribute(attribute),
TYPE=self._NarrowOutputType(attribute.type.id))
return
self._members_emitter.Emit('\n // Shadowing definition.')
self._AddAttributeUsingProperties(attribute, html_name, read_only)
return
# If the type has a conversion we need a getter or setter to contain the
# conversion code.
if (self._OutputConversion(attribute.type.id, attribute.id) or
self._InputConversion(attribute.type.id, attribute.id)):
self._AddAttributeUsingProperties(attribute, html_name, read_only)
return
output_type = self._NarrowOutputType(attribute.type.id)
input_type = self._NarrowInputType(attribute.type.id)
if not read_only:
self._members_emitter.Emit(
'\n $TYPE $NAME;\n',
NAME=DartDomNameOfAttribute(attribute),
TYPE=output_type)
else:
self._members_emitter.Emit(
'\n final $TYPE $NAME;\n',
NAME=DartDomNameOfAttribute(attribute),
TYPE=output_type)
def _AddAttributeUsingProperties(self, attribute, html_name, read_only):
self._AddRenamingGetter(attribute, html_name)
if not read_only:
self._AddRenamingSetter(attribute, html_name)
def _AddRenamingGetter(self, attr, html_name):
conversion = self._OutputConversion(attr.type.id, attr.id)
if conversion:
return self._AddConvertingGetter(attr, html_name, conversion)
return_type = self._NarrowOutputType(attr.type.id)
self._members_emitter.Emit(
'\n $TYPE get $HTML_NAME() native "return this.$NAME;";\n',
HTML_NAME=html_name,
NAME=attr.id,
TYPE=return_type)
def _AddRenamingSetter(self, attr, html_name):
conversion = self._InputConversion(attr.type.id, attr.id)
if conversion:
return self._AddConvertingSetter(attr, html_name, conversion)
self._members_emitter.Emit(
'\n void set $HTML_NAME($TYPE value)'
' native "this.$NAME = value;";\n',
HTML_NAME=html_name,
NAME=attr.id,
TYPE=self._NarrowInputType(attr.type.id))
def _AddConvertingGetter(self, attr, html_name, conversion):
self._members_emitter.Emit(
'\n $RETURN_TYPE get $HTML_NAME => $CONVERT(this._$(HTML_NAME));'
'\n $NATIVE_TYPE get _$HTML_NAME() native "return this.$NAME;";'
'\n',
CONVERT=conversion.function_name,
HTML_NAME=html_name,
NAME=attr.id,
RETURN_TYPE=conversion.output_type,
NATIVE_TYPE=conversion.input_type)
def _AddConvertingSetter(self, attr, html_name, conversion):
self._members_emitter.Emit(
'\n void set $HTML_NAME($INPUT_TYPE value) {'
' this._$HTML_NAME = $CONVERT(value); }'
'\n void set _$HTML_NAME(/*$NATIVE_TYPE*/ value)'
' native "this.$NAME = value;";'
'\n',
CONVERT=conversion.function_name,
HTML_NAME=html_name,
NAME=attr.id,
INPUT_TYPE=conversion.input_type,
NATIVE_TYPE=conversion.output_type)
def AddOperation(self, info, html_name):
"""
Arguments:
info: An OperationInfo object.
"""
if self._HasCustomImplementation(info.name):
return
# Any conversions needed?
if any(self._OperationRequiresConversions(op) for op in info.overloads):
self._AddOperationWithConversions(info, html_name)
else:
self._AddDirectNativeOperation(info, html_name)
def _AddDirectNativeOperation(self, info, html_name):
# Do we need a native body?
if html_name != info.declared_name:
return_type = self._NarrowOutputType(info.type_name)
operation_emitter = self._members_emitter.Emit('$!SCOPE',
MODIFIERS='static ' if info.IsStatic() else '',
TYPE=return_type,
HTML_NAME=html_name,
NAME=info.declared_name,
PARAMS=info.ParametersImplementationDeclaration(
lambda type_name: self._NarrowInputType(type_name)))
operation_emitter.Emit(
'\n'
#' // @native("$NAME")\n;'
' $MODIFIERS$TYPE $(HTML_NAME)($PARAMS) native "$NAME";\n')
else:
self._members_emitter.Emit(
'\n'
' $MODIFIERS$TYPE $NAME($PARAMS) native;\n',
MODIFIERS='static ' if info.IsStatic() else '',
TYPE=self._NarrowOutputType(info.type_name),
NAME=info.name,
PARAMS=info.ParametersImplementationDeclaration(
lambda type_name: self._NarrowInputType(type_name)))
def _AddOperationWithConversions(self, info, html_name):
# Assert all operations have same return type.
assert len(set([op.type.id for op in info.operations])) == 1
info = info.CopyAndWidenDefaultParameters()
output_conversion = self._OutputConversion(info.type_name,
info.declared_name)
if output_conversion:
return_type = output_conversion.output_type
native_return_type = output_conversion.input_type
else:
return_type = self._NarrowInputType(info.type_name)
native_return_type = return_type
def InputType(type_name):
conversion = self._InputConversion(type_name, info.declared_name)
if conversion:
return conversion.input_type
else:
return self._NarrowInputType(type_name)
body = self._members_emitter.Emit(
'\n'
' $MODIFIERS$TYPE $(HTML_NAME)($PARAMS) {\n'
'$!BODY'
' }\n',
MODIFIERS='static ' if info.IsStatic() else '',
TYPE=return_type,
HTML_NAME=html_name,
PARAMS=info.ParametersImplementationDeclaration(InputType))
parameter_names = [param_info.name for param_info in info.param_infos]
parameter_types = [InputType(param_info.dart_type)
for param_info in info.param_infos]
operations = info.operations
method_version = [0]
temp_version = [0]
def GenerateCall(operation, argument_count, checks):
checks = filter(lambda e: e != 'true', checks)
if checks:
(stmts_emitter, call_emitter) = body.Emit(
' if ($CHECKS) {\n$!STMTS$!CALL }\n',
INDENT=' ',
CHECKS=' &&\n '.join(checks))
else:
(stmts_emitter, call_emitter) = body.Emit('$!A$!B', INDENT=' ');
method_version[0] += 1
target = '_%s_%d' % (html_name, method_version[0])
arguments = []
target_parameters = []
for position, arg in enumerate(operation.arguments[:argument_count]):
conversion = self._InputConversion(arg.type.id, operation.id)
param_name = operation.arguments[position].id
if conversion:
temp_version[0] += 1
temp_name = '%s_%s' % (param_name, temp_version[0])
temp_type = conversion.output_type
stmts_emitter.Emit(
'$(INDENT)$TYPE $NAME = $CONVERT($ARG);\n',
TYPE=TypeOrVar(temp_type),
NAME=temp_name,
CONVERT=conversion.function_name,
ARG=parameter_names[position])
arguments.append(temp_name)
param_type = temp_type
verified_type = temp_type # verified by assignment in checked mode.
else:
arguments.append(parameter_names[position])
param_type = self._NarrowInputType(DartType(arg.type.id))
# Verified by argument checking on entry to the dispatcher.
verified_type = InputType(info.param_infos[position].dart_type)
# The native method does not need an argument type if we know the type.
# But we do need the native methods to have correct function types, so
# be conservative.
if param_type == verified_type:
if param_type in ['String', 'num', 'int', 'double', 'bool', 'Object']:
param_type = 'Dynamic'
target_parameters.append(
'%s%s' % (TypeOrNothing(param_type), param_name))
argument_list = ', '.join(arguments)
# TODO(sra): If the native method has zero type checks, we can 'inline' is
# and call it directly with a JS-expression.
call = '%s(%s)' % (target, argument_list)
if output_conversion:
call = '%s(%s)' % (output_conversion.function_name, call)
if operation.type.id == 'void':
call_emitter.Emit('$(INDENT)$CALL;\n$(INDENT)return;\n',
CALL=call)
else:
call_emitter.Emit('$(INDENT)return $CALL;\n', CALL=call)
self._members_emitter.Emit(
' $TYPE$TARGET($PARAMS) native "$NATIVE";\n',
TYPE=TypeOrNothing(native_return_type),
TARGET=target,
PARAMS=', '.join(target_parameters),
NATIVE=info.declared_name)
def GenerateChecksAndCall(operation, argument_count):
checks = ['!?%s' % name for name in parameter_names]
for i in range(0, argument_count):
argument = operation.arguments[i]
parameter_name = parameter_names[i]
test_type = self._DartType(argument.type.id)
if test_type in ['Dynamic', 'Object']:
checks[i] = '?%s' % parameter_name
elif test_type == parameter_types[i]:
checks[i] = 'true'
else:
checks[i] = '(%s is %s || %s === null)' % (
parameter_name, test_type, parameter_name)
# There can be multiple presence checks. We need them all since a later
# optional argument could have been passed by name, leaving 'holes'.
GenerateCall(operation, argument_count, checks)
# TODO: Optimize the dispatch to avoid repeated checks.
if len(operations) > 1:
for operation in operations:
for position, argument in enumerate(operation.arguments):
if self._IsOptional(operation, argument):
GenerateChecksAndCall(operation, position)
GenerateChecksAndCall(operation, len(operation.arguments))
body.Emit(
' throw const Exception("Incorrect number or type of arguments");'
'\n');
else:
operation = operations[0]
argument_count = len(operation.arguments)
for position, argument in list(enumerate(operation.arguments))[::-1]:
if self._IsOptional(operation, argument):
check = '?%s' % parameter_names[position]
GenerateCall(operation, position + 1, [check])
argument_count = position
GenerateCall(operation, argument_count, [])
def _IsOptional(self, operation, argument):
return IsOptional(argument)
def _OperationRequiresConversions(self, operation):
return (self._OperationRequiresOutputConversion(operation) or
self._OperationRequiresInputConversions(operation))
def _OperationRequiresOutputConversion(self, operation):
return self._OutputConversion(operation.type.id, operation.id)
def _OperationRequiresInputConversions(self, operation):
return any(self._InputConversion(arg.type.id, operation.id)
for arg in operation.arguments)
def _OutputConversion(self, idl_type, member):
return FindConversion(idl_type, 'get', self._interface.id, member)
def _InputConversion(self, idl_type, member):
return FindConversion(idl_type, 'set', self._interface.id, member)
def _HasCustomImplementation(self, member_name):
member_name = '%s.%s' % (self._html_interface_name, member_name)
return member_name in _js_custom_members
def HasCustomEventImplementation(self, member_name):
member_name = '%sEvents.%s' % (self._html_interface_name, member_name)
return member_name in _js_custom_members
def _HasJavaScriptIndexingBehaviour(self):
"""Returns True if the native object has an indexer and length property."""
(element_type, requires_indexer) = ListImplementationInfo(
self._interface, self._database)
if element_type and requires_indexer: return True
return False
# ------------------------------------------------------------------------------
class DartLibraryEmitter():
def __init__(self, emitters, template, dart_sources_dir):
self._emitters = emitters
self._template = template
self._dart_sources_dir = dart_sources_dir
self._dart_sources_list = []
def CreateFileEmitter(self, filename):
path = os.path.join(self._dart_sources_dir, filename)
self._dart_sources_list.append(path)
return self._emitters.FileEmitter(path)
def EmitLibrary(self, library_file_path, auxiliary_dir):
def massage_path(path):
# The most robust way to emit path separators is to use / always.
return path.replace('\\', '/')
library_emitter = self._emitters.FileEmitter(library_file_path)
library_file_dir = os.path.dirname(library_file_path)
auxiliary_dir = os.path.relpath(auxiliary_dir, library_file_dir)
imports_emitter = library_emitter.Emit(
self._template, AUXILIARY_DIR=massage_path(auxiliary_dir))
for path in sorted(self._dart_sources_list):
relpath = os.path.relpath(path, library_file_dir)
imports_emitter.Emit(
"#source('$PATH');\n", PATH=massage_path(relpath))
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